<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>The Ajax 02 Page</h1>
<button onclick="doAjaxGet()">Do Ajax Get</button>
<button onclick="doAjaxPost()">Do Ajax Post</button>
<button onclick="doAjaxDelete()">Do Ajax Delete</button>
<button onclick="doAjaxUpdate()">Do Ajax Update</button>
<div id="result"></div>
<script>
<!--Get 请求方式,代码如下:-->
function doAjaxGet(){
let xhr=new XMLHttpRequest();
xhr.onreadystatechange=function(){
if(xhr.readyState==4){
if(xhr.status==200){
document.getElementById("result").innerHTML=xhr.responseText;
}
}
}
xhr.open("GET","http://localhost/doAjaxGet",true);
xhr.send(null);
}
<!--Post 请求方式,代码如下:-->
function doAjaxPost(){
let xhr=new XMLHttpRequest();
xhr.onreadystatechange=function(){
if(xhr.readyState==4){
if(xhr.status==200){
document.getElementById("result").innerHTML=xhr.responseText;
}
}
}
xhr.open("POST","http://localhost/doAjaxPost",true);
//post请求向服务端传递数据,需要设置请求头,必须在open之后
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
//发送请求(post请求传递数据,需要将数据写入到send方法内部)
xhr.send("id=101&name=Computer&remark=Computer...");
}
<!--Update 请求方式,代码如下:-->
function doAjaxUpdate(){
let xhr=new XMLHttpRequest();
xhr.onreadystatechange=function(){
if(xhr.readyState==4){
if(xhr.status==200){
document.getElementById("result").innerHTML=xhr.responseText;
}
}
}
xhr.open("put","http://localhost/doAjaxUpdate",true);
//post请求向服务端传递数据,需要设置请求头,必须在open之后
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
//发送请求(post请求传递数据,需要将数据写入到send方法内部)
xhr.send("id=101&name=Book&remark=Book...");
}
<!--Delete 请求方式,代码如下:-->
function doAjaxDelete(){
let xhr=new XMLHttpRequest();
xhr.onreadystatechange=function(){
if(xhr.readyState==4){
if(xhr.status==200){
document.getElementById("result").innerHTML=xhr.responseText;
}
}
}
xhr.open("delete","http://localhost/doAjaxDelete?id=101",true);
xhr.send(null);
}
</script>
</body>
</html>